A legion of Heroic Warriors protects the magical realm known as Eternia. They are led by Teela: Captain of the Royal Guard, Man-at-Arms: weapons master and combat instructor, and the powerful and heroic He-Man. These heroes, known as the Masters of the Universe, keep threats like the evil Skeletor and his minions at bay. But when an ancient and evil artifact is unearthed from the depths, the Masters of the Universe will have to scour the land in search of this Preternian power... or risk it falling into the hands of their greatest enemies.